WO2022224757A1 - 圧電式バルブ - Google Patents
圧電式バルブ Download PDFInfo
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- WO2022224757A1 WO2022224757A1 PCT/JP2022/015648 JP2022015648W WO2022224757A1 WO 2022224757 A1 WO2022224757 A1 WO 2022224757A1 JP 2022015648 W JP2022015648 W JP 2022015648W WO 2022224757 A1 WO2022224757 A1 WO 2022224757A1
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- Prior art keywords
- valve
- piezoelectric element
- longitudinal direction
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- actuator
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- 230000009471 action Effects 0.000 claims abstract description 59
- 238000006073 displacement reaction Methods 0.000 claims description 55
- 229920001296 polysiloxane Polymers 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 4
- 230000008602 contraction Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 21
- 229910052782 aluminium Inorganic materials 0.000 description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 230000036278 prepulse Effects 0.000 description 8
- 239000007769 metal material Substances 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 229910001374 Invar Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 235000013339 cereals Nutrition 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000003562 lightweight material Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
Definitions
- the present invention relates to a piezoelectric valve that opens and closes using the displacement of a piezoelectric element.
- the piezoelectric valves described in Patent Documents 1 and 2 are provided with an actuator that utilizes the characteristics of a piezoelectric element with excellent high-speed response performance, and the actuator magnifies a small displacement of the piezoelectric element based on the principle of leverage. It has a displacement magnifying mechanism.
- the piezoelectric valve Since the piezoelectric valve has excellent responsiveness, when it is used as an ejector valve of an optical sorter for grains such as rice grains to remove defective products, good products are less likely to be removed as a side effect. It has been found from tests and experience that the contamination rate of the removed defective products is higher than that of electromagnetic valves.
- the piezoelectric valve is used as an ejector valve of the optical sorter, for example, as described in Patent Document 2, a manifold having a space inside to which compressed air is supplied from a compressed air source is used.
- the ejector is mounted directly and continuously, and a large number of nozzle holes are opened at the tip of the ejector.
- the valve seat plate to which the actuator is fixed is housed inside the case of the valve body.
- the actuator has a displacement magnifying mechanism with a complicated structure including an arm, leaf springs, etc., and the thickness and width of the actuator cannot be reduced. Therefore, when the piezoelectric valve is provided with a plurality of air discharge ports, it is difficult to reduce the pitch of the air discharge ports.
- the dimension of the thickness width of the actuator can be made smaller than that of the conventional one. can be reduced.
- the present invention is an improvement of the piezoelectric valve of the previous invention, and is capable of reducing ripples generated in the displacement waveform of the valve body in the actuator and discharging the compressed gas in a stable state from the gas discharge port.
- the purpose is to provide a valve.
- the present invention an actuator that drives the valve body; a valve seat plate that has a valve seat and a discharge passage contacting and separating from the valve body and that fixes the actuator;
- a piezoelectric valve comprising a body case that houses the valve seat plate,
- the actuator is a base secured to the valve seat plate; a piezoelectric element having one end connected to the mounting surface of the base and extending in a first longitudinal direction; a support portion integrally provided with the base portion and extending in a second longitudinal direction parallel to the piezoelectric element and intersecting with the first longitudinal direction; an action portion to which the other end portion of the piezoelectric element and the tip portion of the support portion are connected and which is displaced in directions different from the first longitudinal direction and the second longitudinal direction as the piezoelectric element expands and contracts; the valve body provided on the side of the action portion in the direction of displacement and driven by the displacement of the action portion;
- the support portion has a constricted portion in the second longitudinally extending intermediate portion, and is fixed to the valve
- the present invention a plurality of actuators that individually drive the plurality of valve bodies in parallel planes; a valve seat plate that has a plurality of valve seats and discharge channels that are individually in contact with and separate from the plurality of valve bodies, and that fixes the plurality of actuators;
- a piezoelectric valve comprising a body case that houses the valve seat plate, each of the plurality of actuators, a base secured to the valve seat plate; a piezoelectric element having one end connected to the mounting surface of the base and extending in a first longitudinal direction; a support portion integrally provided with the base portion and extending in a second longitudinal direction parallel to the piezoelectric element and intersecting with the first longitudinal direction; an action portion to which the other end portion of the piezoelectric element and the tip portion of the support portion are connected and which is displaced in directions different from the first longitudinal direction and the second longitudinal direction as the piezoelectric element expands and contracts; the valve body provided on the side of the action portion in the direction of displacement and driven by
- the body case is a gas supply port to which compressed gas is supplied; a plurality of gas discharge ports for individually discharging the compressed gas supplied from the gas supply port through the respective discharge passages of the valve seat plate due to the separation between the plurality of valve bodies and the plurality of valve seats; characterized by comprising
- the support portion is integrally formed with the base portion by forming the support portion integrally with the base portion from a metal material such as stainless steel including Invar material.
- the support portion can also be provided integrally with the base portion by attaching a separate member made of, for example, stainless steel containing Invar material to the base portion.
- the base is fixed to the valve seat plate at least on the side to which one end of the piezoelectric element is connected.
- the present invention can also be fixed to the valve seat plate on the side where the support is provided.
- the amount of displacement of the valve body is adjusted by the length from the constricted portion to the tip portion of the support portion.
- the support portion is provided with a plurality of mounting holes along the second longitudinal direction between the constricted portion and the base portion on the side of the base portion relative to the constricted portion, Preferably, the support portion is screw-fixed to the valve seat plate using at least one of the mounting holes.
- At least one of the one end portion and the other end portion of the piezoelectric element may be connected to the mounting surface of the base portion or the action portion via a connecting portion made of a material having a larger coefficient of linear expansion than the support portion. preferable.
- the connecting portion is provided integrally with the action portion, It is preferable that the other end portion of the piezoelectric element is connected to the action portion via the connection portion made of a material having a larger coefficient of linear expansion than the support portion.
- connection portion is formed integrally with the action portion from a metal material such as an aluminum material so as to be provided integrally with the action portion.
- the connecting portion can also be provided integrally with the acting portion by attaching a separate member made of, for example, an aluminum block to the acting portion.
- the actuator further includes a compression member connected to each of the base portion and the action portion and compressing the piezoelectric element in the first longitudinal direction.
- the actuator includes the compressing member connected to each of the base portion and the acting portion and configured to compress the piezoelectric element in the first longitudinal direction so as to be positioned substantially on the central axis of the piezoelectric element.
- a gap formed between the piezoelectric element and the support portion and between the base portion and the action portion is filled with silicone to fill the gap with the silicone.
- a gap formed between the piezoelectric element and the support portion between the base portion and the action portion be equally spaced, and that the gap be filled with the silicone.
- a gap formed between the base portion and the action portion and between the side where the piezoelectric element extends in the first longitudinal direction and the side where the support portion extends in the second longitudinal direction is filled with silicone. and filling the gap with the silicone.
- a gap formed between the base portion and the action portion and between the side where the piezoelectric element extends in the first longitudinal direction and the side where the support portion extends in the second longitudinal direction is defined as an equal interval. preferably.
- the actuator is integrated with a base portion fixed to the valve seat plate, a piezoelectric element having one end connected to a mounting surface of the base portion and extending in a first longitudinal direction, and the base portion.
- a supporting portion provided parallel to the piezoelectric element and extending in a second longitudinal direction crossing the first longitudinal direction is connected to the other end portion of the piezoelectric element and the tip portion of the supporting portion, and expands and contracts the piezoelectric element.
- the valve body, and the support portion has a constricted portion at an intermediate portion extending in the second longitudinal direction, and is fixed to the valve seat plate on the base portion side of the constricted portion.
- the actuator adjusts the amount of displacement of the valve body according to the length from the constricted portion to the tip portion of the support portion, the gas is discharged from the gas discharge port.
- the amount of compressed gas discharged can be adjusted.
- At least one of the one end portion and the other end portion of the piezoelectric element is connected to the mounting surface of the base portion or the mounting surface of the base portion via a connecting portion made of a material having a larger coefficient of linear expansion than the support portion.
- the actuator further comprises a compression member connected to each of the base portion and the action portion and compressing the piezoelectric element in the first longitudinal direction, the load in the tensile direction is It is possible to prevent damage to the piezoelectric element, which is easily damaged.
- the actuator is connected to each of the base portion and the action portion, and the compression member for compressing the piezoelectric element in the first longitudinal direction is positioned substantially on the central axis of the piezoelectric element. If the compression member is provided so as to prevent the torsional force of the compression member from acting on the piezoelectric element, damage to the piezoelectric element can be effectively prevented.
- a gap formed between the base portion and the action portion and between the piezoelectric element and the support portion is equally spaced, and the gap is filled with the silicone. Then, the gap can be easily filled with silicone.
- FIG. 1 is a perspective view of a piezoelectric valve
- FIG. FIG. 4 is an explanatory diagram of a piezoelectric valve
- FIG. 4 is a perspective view of a state in which the actuator is fixed to the valve seat plate
- FIG. 4 is an explanatory diagram of a state in which an actuator is fixed to a valve seat plate
- FIG. 4 is an explanatory diagram of a state in which an actuator is fixed to a valve seat plate
- FIG. 4 is an explanatory diagram of a displacement waveform of a valve body in the actuator of the previous invention
- FIG. 4 is an explanatory diagram of an actuator according to Embodiment 1 of the present invention
- FIG. 4 is an explanatory diagram of a displacement waveform of the valve body in the actuator of Embodiment 1 of the present invention
- FIG. 8 is an explanatory diagram of an actuator according to Embodiment 2 of the present invention
- FIG. 10 is an explanatory diagram of a displacement waveform of the valve body in the actuator of Embodiment 2 of the present invention
- FIG. 10 is an explanatory diagram of an actuator according to Embodiment 3 of the present invention
- FIG. 11 is an explanatory diagram of a displacement waveform of a valve body in an actuator according to Embodiment 3 of the present invention
- FIG. 1 shows a perspective view of a piezoelectric valve.
- FIG. 2 is an explanatory diagram of the piezoelectric valve, showing a side view.
- the piezoelectric valve 1 includes a valve body 2, an actuator 3, which will be described later, and a valve seat plate 4, which will be described later, disposed inside the valve body 2 with the actuator 3 being fixed.
- the valve body 2 is a case whose rear surface (bottom surface in FIGS. 1 and 2) is open, and has a gas pressure chamber inside which receives compressed gas from an external compressed gas supply source (not shown). Prepare. Further, on the front surface (upper surface in FIGS. 1 and 2) of the valve body 2, there is provided a connector portion for mounting on a manifold (not shown) having a space inside for supplying compressed gas from the compressed gas supply source. 5 is provided.
- a gas inlet 51 for sucking compressed gas into the valve body 2 and a plurality of gas outlets 52 for discharging the compressed gas are opened on the front surface of the connector portion 5 . Further, on the front surface of the valve body 2, a gas supply port (not shown) communicating with the gas suction port 51 of the connector portion 5 and a plurality of gas discharge ports (not shown) communicating with the respective gas discharge ports 52 are provided. not shown) opens.
- the rear surface of the valve body 2 is closed by a cover body 6, and the cover body 6 is provided with a wiring connector 61 for supplying power to the piezoelectric element 32, which will be described later.
- FIG. 3 shows a perspective view of the actuator fixed to the valve seat plate.
- FIG. 4 is an explanatory diagram of a state in which the actuator is fixed to the valve seat plate, and shows a side view of the valve seat plate in FIG. 3 .
- FIG. 5 is an explanatory diagram of a state in which the actuator is fixed to the valve seat plate, and shows a view of the valve seat plate of FIGS. 3 and 4 as viewed from the front side.
- the piezoelectric valve 1 accommodates a valve seat plate 4 to which an actuator 3 is fixed inside the valve body 2 .
- the valve seat plate 4 is an example of a valve seat plate to which two actuators 3 can be attached.
- a valve seat 42 is provided against which the valve body 35 of the actuator 3 abuts.
- a mounting portion 43 for the actuator 3 is formed on one surface side of the valve seat plate 4 at a position facing one side surface of the valve seat portion 41 .
- a mounting portion 44 for the actuator 3 is formed on the other side of the valve seat plate 4 at a position facing the other side of the valve seat portion 41 .
- the two actuators 3 are arranged on the mounting portions 43 and 44 of the valve seat plate 4 and fixed by screws so that the valve bodies 35 face the valve seats 42 .
- the valve seat portion 41 is formed with a plurality of discharge passages 45 that open to the valve seat surfaces of the valve seats 42 , and the discharge passages 45 open to the front surface (upper surface in FIG. 4 ) of the valve seat plate 4 . do.
- the valve seat plate 4 is arranged inside the valve body 2 in a state in which the two actuators 3 are fixed.
- a discharge passage 45 communicates with each of the gas discharge ports opened in the front surface of the valve body 2 .
- two valve seat plates 4 are housed in the case of the valve body 2 side by side in the width direction, and four gas discharge ports are opened on the front surface of the valve body 2. .
- actuators 3 are arranged in the case of the valve body 2, and four gas discharge ports are opened in the front surface of the valve body 2, but the present invention is not limited to this. Instead, one or more actuators 3 can be arranged within the valve body.
- FIG. 6 shows an explanatory diagram of an actuator provided in the piezoelectric valve of the previous invention.
- the actuator 3 of the previous invention includes a base portion 31 fixed to the valve seat plate 4, a piezoelectric element 32 having one end connected to the mounting surface of the base portion 31 and extending in the first longitudinal direction, and the base portion 31 integrally formed.
- a support portion 33 extending in a second longitudinal direction crossing the first longitudinal direction is provided alongside the piezoelectric element 32 .
- the actuator 3 of the previous invention is connected to the other end of the piezoelectric element 32 and the tip of the support portion 33, and along with the expansion and contraction of the piezoelectric element 32, the actuator 3 moves in the first longitudinal direction and the second longitudinal direction.
- the action portion 34 expands in the first longitudinal direction and the second longitudinal direction within a plane substantially parallel to a plane containing the first longitudinal direction and the second longitudinal direction. It is displaced in a direction different from each of the longitudinal directions.
- the displacement of the action portion 34 accompanying expansion and contraction of the piezoelectric element 32 can be increased.
- connection member 311 made of, for example, an aluminum block or the like can be attached to the attachment surface of the base portion 31 .
- the actuator 3 can connect the base portion 31 and the action portion 34 with a compression member 36 .
- FIG. 7 shows an explanatory diagram of the displacement waveform of the valve body in the actuator of the previous invention.
- the displacement waveform of the valve body 35 shown in FIG. 7 is obtained when a drive voltage is applied to the piezoelectric element 32 in the actuator 3 of the prior invention shown in FIG.
- the amount of displacement of the valve body 35 is measured by a laser measuring instrument.
- the piezoelectric valve of the present invention is an actuator improvement over the piezoelectric valve of the previous invention.
- FIG. 8 shows an explanatory diagram of an actuator according to Embodiment 1 of the present invention.
- the actuator 3 of Embodiment 1 includes a base portion 31 fixed to the valve seat plate 4 , a piezoelectric element 32 having one end connected to the mounting surface of the base portion 31 and extending in the first longitudinal direction, and a piezoelectric element 32 integrally formed with the base portion 31 .
- a support portion 33 is provided and extends in a second longitudinal direction that intersects with the first longitudinal direction in parallel with the piezoelectric element 32 .
- the actuator 3 of Embodiment 1 is connected to the other end portion of the piezoelectric element 32 and the tip portion of the support portion 33 , and expands and contracts in the first longitudinal direction and the second longitudinal direction as the piezoelectric element 32 expands and contracts.
- the base portion 31 includes a side to which one end portion of the piezoelectric element 32 is connected and a side to which the support portion 33 is integrally provided. It is fixed to the valve seat plate 4 by screws on the side where the support portion 33 is provided.
- the support portion 33 has a constricted portion 331 at an intermediate portion extending in the second longitudinal direction, and is closer to the base portion 31 than the constricted portion 331, and A mounting hole 38 provided between the portion 331 and the base portion 31 is used to fix the valve seat plate 4 with screws.
- the base portion 31 may be fixed to the valve seat plate 4 at least on the side to which one end portion of the piezoelectric element 32 is connected.
- the base portion 31 and the support portion 33 can be integrally formed by punching a metal material such as stainless steel including Invar material. If the base portion 31 and the support portion 33 are integrally formed by punching the metal material, the number of parts can be reduced and the assembly of the actuator 3 can be facilitated.
- the base portion 31 and the support portion 33 can be formed by separate members, and the support portion 33 can be provided integrally with the base portion 31 by attaching the support portion 33 as a separate member to the base portion 31 .
- the acting portion 34 can be made of a lightweight material such as aluminum. Forming the action portion 34 from a lightweight material such as aluminum is preferable for displacing the action portion 34 .
- the valve body 35 is made of rubber or the like, and preferably lubricating rubber.
- the actuator 3 can connect the base portion 31 and the action portion 34 with a compression member 36 . Since the piezoelectric element 32 is easily damaged by a load in the tensile direction, the compression member 36 connects the base portion 31 and the action portion 34 . As a result, the piezoelectric element 32 can be compressed in the first longitudinal direction, so damage to the piezoelectric element 32 can be prevented.
- FIG. 9 shows an explanatory diagram of the displacement waveform of the valve body in the actuator of Embodiment 1 of the present invention.
- the displacement waveform of the valve body 35 shown in FIG. 9 is obtained when a driving voltage is applied to the piezoelectric element 32 in the actuator 3 of Embodiment 1 shown in FIG. is measured by a laser measuring instrument.
- the piezoelectric valve of the present invention which includes the actuator 3 of the first embodiment, can stably discharge the compressed gas from the gas discharge port as compared with the piezoelectric valve of the previous invention.
- FIG. 10 shows an explanatory diagram of an actuator according to Embodiment 2 of the present invention.
- the actuator 3 of Embodiment 1 is such that the other end portion of the piezoelectric element 32 is connected to the action portion via a connection portion 37 made of a material having a larger coefficient of linear expansion than that of the support portion 33 . 34.
- the other end portion of the piezoelectric element 32 is connected to the action portion 34 via a connection portion 37 made of a material having a larger coefficient of linear expansion than the support portion 33.
- the effect of thermal contraction of the piezoelectric element 32 due to change can be reduced or eliminated.
- the connecting portion 37 is provided integrally with the acting portion 34, and can be integrally formed by, for example, punching a metal material such as an aluminum material. If the action portion 34 and the connecting portion 37 are integrally formed by punching a lightweight metal material such as aluminum, the number of parts can be reduced and the assembly of the actuator 3 can be facilitated.
- the connecting portion 37 is formed of a separate member made of, for example, an aluminum block or the like, and the connecting portion 37 is provided integrally with the acting portion 34 by attaching the connecting portion 37, which is a separate member, to the acting portion 34.
- One end of the piezoelectric element 32 can be connected to the mounting surface of the base 31 via the connecting portion 37 by forming the connecting portion 37 from a separate member made of, for example, an aluminum block. .
- FIG. 11 shows an explanatory diagram of the displacement waveform of the valve body in the actuator of Embodiment 2 of the present invention.
- the displacement waveform of the valve body 35 shown in FIG. 11 is generated when a driving voltage is applied to the piezoelectric element 32 in the actuator 3 of the second embodiment shown in FIG. is measured by a laser measuring instrument.
- the piezoelectric valve of the present invention can stably discharge the compressed gas from the gas discharge port as compared with the piezoelectric valve of the previous invention.
- FIG. 12 shows an explanatory diagram of an actuator according to Embodiment 3 of the present invention.
- the actuator 3 of Embodiment 2 is connected to the base portion 31 and the action portion 34, and the compression member 36 that compresses the piezoelectric element 32 in the first longitudinal direction is replaced with the compression member 36 that compresses the piezoelectric element 32 in the first longitudinal direction. It is provided so as to be positioned substantially on the central axis of the piezoelectric element 32 along one longitudinal direction.
- the actuator 3 of Embodiment 3 is connected to the base portion 31 and the action portion 34, respectively, and the compression member 36 for compressing the piezoelectric element 32 in the first longitudinal direction is positioned substantially on the central axis of the piezoelectric element 32. Since the compression member 36 does not exert a torsional force on the piezoelectric element 32, damage to the piezoelectric element 32 can be effectively prevented.
- FIG. 13 shows an explanatory diagram of the displacement waveform of the valve body in the actuator of Embodiment 3 of the present invention.
- the displacement waveform of the valve body 35 shown in FIG. 13 is also obtained when the drive voltage is applied to the piezoelectric element 32 in the actuator 3 of the third embodiment shown in FIG. is measured by a laser measuring instrument.
- the piezoelectric valve of the present invention can stably discharge the compressed gas from the gas discharge port by including the actuator 3 of the third embodiment, as compared with the piezoelectric valve of the previous invention.
- the actuator 3 adjusts the amount of displacement of the valve body 35 by the length from the constricted portion 331 of the support portion 33 to the tip portion of the support portion 33 connected to the action portion 34. can be adjusted to adjust the discharge amount of the compressed gas discharged from the gas discharge port. That is, the piezoelectric valve of the present invention uses the actuator 3 including the support portion 33 having a long length from the constricted portion 331 to the tip portion, thereby increasing the displacement amount of the valve body 35 and It is possible to increase the amount of compressed gas discharged from the discharge port.
- the piezoelectric valve of the present invention uses the actuator 3 including the support portion 33 having a short length from the constricted portion 331 to the tip portion, thereby reducing the amount of displacement of the valve body 35 and reducing the displacement of the gas. It is possible to reduce the amount of compressed gas discharged from the discharge port.
- the support portion 33 is provided with a plurality of mounting holes 38 along the second longitudinal direction on the base portion 31 side of the constricted portion 331.
- the support 33 can also be screwed to the valve seat plate 4 using at least one mounting hole 38 .
- the support portion 33 is provided with a plurality of mounting holes 38 along the second longitudinal direction on the base portion 31 side of the constricted portion 331, and the support portion 33 is provided with: If at least one mounting hole 38 is used to fix the valve seat plate 4 to the valve seat plate 4, the position of the mounting hole 38 for fixing the support portion 33 to the valve seat plate 4 determines the position of the valve body 35. can be adjusted to adjust the discharge amount of the compressed gas discharged from the gas discharge port.
- a gap formed between the base portion 31 and the action portion 34 and between the piezoelectric element 32 and the support portion 33 is filled with silicone.
- the gap can be filled with the silicone.
- the actuator 3 at least one of the one end portion and the other end portion of the piezoelectric element 32 is connected through a connecting portion 37 made of a material having a larger coefficient of linear expansion than that of the supporting portion 33 .
- a connecting portion 37 made of a material having a larger coefficient of linear expansion than that of the supporting portion 33 .
- the actuator 3 is arranged between the base portion 31 and the action portion 34, the piezoelectric element 32 extending in the first longitudinal direction and the support portion 33 extending in the second longitudinal direction. If silicone is used to fill the gap formed between the side extending inward, the ripple generated in the displacement waveform of the valve body 35 can be further effectively reduced by the damping effect of the silicone rubber. .
- the gap formed between the base portion 31 and the action portion 34 and between the piezoelectric element 32 and the support portion 33 is made equal. be able to.
- the actuator 3 is arranged between the base portion 31 and the action portion 34, the piezoelectric element 32 extending in the first longitudinal direction and the support portion 33 extending in the second longitudinal direction. If the gap formed between the side extending inward is made equal and the gap is filled with silicone, the gap can be easily filled with silicone.
- the piezoelectric valve of the present invention is extremely useful because it can reduce ripples generated in the displacement waveform of the valve body and stably discharge the compressed gas from the gas discharge port.
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Abstract
Description
弁体を駆動するアクチュエータと、
前記弁体と接離する弁座及び排出路を有し、前記アクチュエータを固定する弁座プレートと、
前記弁座プレートを収納する本体ケースと、を備える圧電式バルブであって、
前記アクチュエータは、
前記弁座プレートに固定される基部と、
前記基部の取付け面に一端部が接続され、第1長手方向に延びる圧電素子と、
前記基部に一体に設けられ、前記圧電素子と並んで前記第1長手方向と交差する第2長手方向に延びる支持部と、
前記圧電素子の他端部及び前記支持部の先端部とが接続され、前記圧電素子の伸縮に伴って、前記第1長手方向及び前記第2長手方向それぞれと異なる方向に変位する作用部と、
前記作用部の前記変位する方向の側に設けられ、前記作用部の変位によって駆動される前記弁体と、を備え、
前記支持部は、前記第2長手方向に延びる中間部分にくびれ部を有し、前記くびれ部よりも前記基部の側であって、前記くびれ部と前記基部との間において前記弁座プレートに固定され、
前記本体ケースは、
圧縮気体が供給される気体供給口と、
前記気体供給口から供給された圧縮気体を前記弁体と前記弁座との離間によって前記弁座プレートの前記排出路を介して排出する気体排出口と、
を備えることを特徴とする。
複数の弁体をそれぞれ個別に平行な面内で駆動する複数のアクチュエータと、
前記複数の弁体とそれぞれ個別に接離する弁座及び排出路を複数有し、前記複数のアクチュエータを固定する弁座プレートと、
前記弁座プレートを収納する本体ケースと、を備える圧電式バルブであって、
前記複数のアクチュエータのそれぞれは、
前記弁座プレートに固定される基部と、
前記基部の取付け面に一端部が接続され、第1長手方向に延びる圧電素子と、
前記基部に一体に設けられ、前記圧電素子と並んで前記第1長手方向と交差する第2長手方向に延びる支持部と、
前記圧電素子の他端部及び前記支持部の先端部とが接続され、前記圧電素子の伸縮に伴って、前記第1長手方向及び前記第2長手方向それぞれと異なる方向に変位する作用部と、
前記作用部の前記変位する方向の側に設けられ、前記作用部の変位によって駆動される前記弁体と、を備え、
前記支持部は、前記第2長手方向に延びる中間部分にくびれ部を有し、前記くびれ部よりも前記基部の側であって、前記くびれ部と前記基部との間において前記弁座プレートに固定され、
前記本体ケースは、
圧縮気体が供給される気体供給口と、
前記気体供給口から供給された圧縮気体を前記複数の弁体と前記複数の弁座との離間によって前記弁座プレートの前記各排出路を介してそれぞれ個別に排出する複数の気体排出口と、
を備えることを特徴とする。
前記支持部が、例えばインバー材を含むステンレス材等の金属材料により前記基部と一体に成形されることで、前記基部に一体に設けられることが好ましい。
前記支持部が、前記基部に例えばインバー材を含むステンレス材等からなる別部材を取り付けることで、前記基部に一体に設けることもできる。
前記基部が、少なくとも前記圧電素子の一端部が接続される側において前記弁座プレートに固定されることが好ましい。
本発明は、
前記基部が、前記支持部が設けられる側において前記弁座プレートに固定することもできる。
前記支持部の前記くびれ部から前記先端部までの長さにより、前記弁体の変位量を調整することが好ましい。
前記支持部には、前記くびれ部よりも前記基部の側であって、前記くびれ部と前記基部との間において前記第2長手方向に沿って複数の取付け穴が設けられ、
前記支持部は、少なくとも1つの前記取付け穴を利用して前記弁座プレートにネジ固定されることが好ましい。
前記圧電素子の前記一端部又は前記他端部の少なくとも一方が、前記支持部よりも線膨張係数の大きな材料からなる連結部を介して前記基部の取付け面又は前記作用部に接続されることが好ましい。
前記連結部が、前記作用部に一体に設けられ、
前記圧電素子の前記他端部が、前記支持部よりも線膨張係数の大きな材料からなる前記連結部を介して前記作用部に接続されることが好ましい。
前記連結部が、アルミニウム材等の金属材料により前記作用部と一体に成形されることで、前記作用部に一体に設けられることが好ましい。
前記連結部が、前記作用部に例えばアルミブロック等からなる別部材を取り付けることで、前記作用部に一体に設けることもできる。
前記アクチュエータが、前記基部及び前記作用部のそれぞれに連結され、前記圧電素子を前記第1長手方向に圧縮する圧縮部材をさらに備えることが好ましい。
前記アクチュエータが、前記基部及び前記作用部のそれぞれに連結され、前記圧電素子を前記第1長手方向に圧縮する前記圧縮部材を前記圧電素子の略中心軸上に位置するように備えることが好ましい。
前記基部と前記作用部との間であって、前記圧電素子と前記支持部との間に形成される隙間にシリコーンを充填し、前記隙間を前記シリコーンで埋めることが好ましい。
前記基部と前記作用部との間であって、前記圧電素子と前記支持部との間に形成される隙間を等間隔とし、前記隙間を前記シリコーンで埋めることが好ましい。
前記基部と前記作用部との間であって、前記圧電素子が前記第1長手方向に延びる側と前記支持部が前記第2長手方向に延びる側との間に形成される隙間にシリコーンを充填し、前記隙間を前記シリコーンで埋めることが好ましい。
前記基部と前記作用部との間であって、前記圧電素子が前記第1長手方向に延びる側と前記支持部が前記第2長手方向に延びる側との間に形成される隙間を等間隔とすることが好ましい。
[圧電式バルブの基本構成]
まず、本発明における圧電式バルブの基本構成について説明する。
図1は圧電式バルブの斜視図を示す。図2は圧電式バルブの説明図であって側面側から見た図を示す。
前記圧電式バルブ1は、バルブ本体2、後述するアクチュエータ3、及び前記アクチュエータ3が固定された状態で前記バルブ本体2の内部に配設される後述する弁座プレート4を備える。
また、前記バルブ本体2の前面(図1及び図2では上面)には、前記圧縮気体供給源から圧縮気体が供給される空間を内部に有するマニホールド(図示せず)に装着するためのコネクタ部5が設けられる。
また、前記バルブ本体2の前面には、前記コネクタ部5の前記気体吸入口51と連通する気体供給口(図示せず)、及び前記各気体排出口52と連通する複数の気体排出口(図示せず)が開口する。
前記バルブ本体2の後面はカバー体6により閉鎖され、前記カバー体6には後述する圧電素子32に給電するための配線コネクタ61が配設される。
前記圧電式バルブ1は、アクチュエータ3を固定した弁座プレート4を前記バルブ本体2の内部に収納するものである。
前記弁座プレート4は、2つのアクチュエータ3を取り付けることが可能な弁座プレートの一例であって、中央部分に弁座部41を有し、前記弁座部41の相対する両側面にそれぞれ前記アクチュエータ3の弁体35が当接する弁座42が設けられる。
また、前記弁座プレート4の他面側には、前記弁座部41の他方の側面に対向する位置に前記アクチュエータ3の取り付け部44が形成される。
前記2つのアクチュエータ3は、前記各弁体35が前記各弁座42に対峙するよう、前記弁座プレート4の前記各取り付け部43,44に配設されネジにより固定される。
前記弁座プレート4は、前記2つのアクチュエータ3が固定された状態で前記バルブ本体2の内部に配設され、前記バルブ本体2の前面側から前記前面がネジにより固定されることで、前記各排出路45が前記バルブ本体2の前面に開口する前記各気体排出口と連通する。
図6は先発明の圧電式バルブが備えるアクチュエータの説明図を示す。
先発明のアクチュエータ3は、弁座プレート4に固定される基部31と、前記基部31の取付け面に一端部が接続され、第1長手方向に延びる圧電素子32と、前記基部31とが一体成形され、前記圧電素子32と並んで前記第1長手方向と交差する第2長手方向に延びる支持部33を備える。
その際、前記支持部33の前記第2長手方向に延びる中間部分にくびれ部331を設けることで、前記圧電素子32の伸縮に伴う前記作用部34の変位を拡大することができる。
図7に示す弁体35の変位波形は、図6に示す先発明のアクチュエータ3において圧電素子32に駆動電圧を印加し、該圧電素子32を伸長させて弁体35を開弁駆動する際の当該弁体35の変位量をレーザー計測器により計測したものである。
(1)駆動電圧:72V
(2)入力信号:第1プレパルス時間 t1=0.097ms
第1休止時間 t2=0.077ms
第2プレパルス時間 t3=0.6ms
第2休止時間 t4=0.01ms
メインパルス時間 t5=0.216ms
(圧電素子の通電時間:1ms)
したがって、先発明の圧電式バルブは、気体排出口から圧縮気体が安定した状態で排出されないことが懸念される。
本発明の圧電式バルブは、先発明の圧電式バルブにおいてアクチュエータを改良するものである。
図8は本発明の実施形態1におけるアクチュエータの説明図を示す。
実施形態1のアクチュエータ3は、弁座プレート4に固定される基部31と、前記基部31の取付け面に一端部が接続され、第1長手方向に延びる圧電素子32と、前記基部31に一体に設けられ、前記圧電素子32と並んで前記第1長手方向と交差する第2長手方向に延びる支持部33を備える。
前記基部31及び前記支持部33を、前記金属材料を打ち抜いて一体成形すれば、部品点数が削減され、前記アクチュエータ3の組立てが容易となる。
また、前記弁体35は、ゴム製等であって、好ましくは滑性ゴムとすることができる。
圧電素子32は引張方向の荷重に対し損傷しやすいため、前記基部31と前記作用部34の間を前記圧縮部材36で連結する。これによって、前記圧電素子32を前記第1長手方向に圧縮することができるため、前記圧電素子32の損傷を防止できる。
図9に示す弁体35の変位波形は、図8に示す実施形態1のアクチュエータ3において圧電素子32に駆動電圧を印加し、該圧電素子32を伸長させて弁体35を開弁駆動する際の当該弁体35の変位量をレーザー計測器により計測したものである。
(1)駆動電圧:72V
(2)入力信号:第1プレパルス時間 t1=0.06ms
第1休止時間 t2=0.012ms
第2プレパルス時間 t3=0.89ms
第2休止時間 t4=0.035ms
メインパルス時間 t5=0.003ms
(圧電素子の通電時間:1ms)
したがって、本発明の圧電式バルブは、実施形態1のアクチュエータ3を備えることで、先発明の圧電式バルブと比較して、気体排出口から圧縮気体を安定した状態で排出することができる。
図10は本発明の実施形態2におけるアクチュエータの説明図を示す。
実施形態2のアクチュエータ3は、上記実施形態1のアクチュエータ3において、前記圧電素子32の他端部が、前記支持部33よりも線膨張係数の大きな材料からなる連結部37を介して前記作用部34に接続されるものである。
前記作用部34及び前記連結部37を、アルミニウム材等の軽量な金属材料を打ち抜いて一体成形すれば、部品点数が削減され、前記アクチュエータ3の組み立てが容易となる。
図11に示す弁体35の変位波形は、図10に示す実施形態2のアクチュエータ3において圧電素子32に駆動電圧を印加し、該圧電素子32を伸長させて弁体35を開弁駆動する際の当該弁体35の変位量をレーザー計測器により計測したものである。
(1)駆動電圧:72V
(2)入力信号:第1プレパルス時間 t1=0.058ms
第1休止時間 t2=0.008ms
第2プレパルス時間 t3=0.877ms
第2休止時間 t4=0.046ms
メインパルス時間 t5=0.011ms
(圧電素子の通電時間:1ms)
したがって、本発明の圧電式バルブは、実施形態2のアクチュエータ3を備えることで、先発明の圧電式バルブと比較して、気体排出口から圧縮気体を安定した状態で排出することができる。
図12は本発明の実施形態3におけるアクチュエータの説明図を示す。
実施形態3のアクチュエータ3は、上記実施形態2のアクチュエータ3において、前記基部31及び前記作用部34に連結され、前記圧電素子32を前記第1長手方向に圧縮する前記圧縮部材36を、前記第1長手方向に沿って前記圧電素子32の略中心軸上に位置するように備えるものである。
図13に示す弁体35の変位波形も、図12に示す実施形態3のアクチュエータ3において圧電素子32に駆動電圧を印加し、該圧電素子32を伸長させて弁体35を開弁駆動する際の当該弁体35の変位量をレーザー計測器により計測したものである。
(1)駆動電圧:72V
(2)入力信号:第1プレパルス時間 t1=0.054ms
第1休止時間 t2=0.015ms
第2プレパルス時間 t3=0.875ms
第2休止時間 t4=0.046ms
メインパルス時間 t5=0.01ms
(圧電素子の通電時間:1ms)
したがって、本発明の圧電式バルブは、実施形態3のアクチュエータ3を備えることでも、先発明の圧電式バルブと比較して、気体排出口から圧縮気体を安定した状態で排出することができる。
上記本発明の実施形態におけるアクチュエータ3は、前記支持部33の前記くびれ部331から前記作用部34に接続される前記支持部33の先端部までの長さにより、前記弁体35の変位量を調整し、前記気体排出口から排出される圧縮気体の排出量を調整することができる。
すなわち、本発明の圧電式バルブは、前記くびれ部331から前記先端部までの長さが長い前記支持部33を備えるアクチュエータ3を用いることで、前記弁体35の変位量を大きくし、前記気体排出口から排出される圧縮気体の排出量を多くすることができる。
また、本発明の圧電式バルブは、前記くびれ部331から前記先端部までの長さが短い前記支持部33を備えるアクチュエータ3を用いることで、前記弁体35の変位量を小さくし、前記気体排出口から排出される圧縮気体の排出量を少なくすることができる。
上記本発明の実施形態におけるアクチュエータ3において、前記支持部33に前記くびれ部331よりも前記基部31の側において前記第2長手方向に沿って複数の取付け穴38を設け、前記支持部33を、少なくとも1つの前記取付け穴38を利用して前記弁座プレート4にネジ固定することとすれば、前記支持部33を前記弁座プレート4に固定する前記取付け穴38の位置により、前記弁体35の変位量を調整し、前記気体排出口から排出される圧縮気体の排出量を調整することができる。
2 バルブ本体
3 アクチュエータ
31 基部
311 連結部材
32 圧電素子
33 支持部
331 くびれ部
34 作用部
35 弁体
36 圧縮部材
37 連結部
38 取付け穴
4 弁座プレート
41 弁座部
42 弁座
43 取り付け部
44 取り付け部
45 排出路
5 コネクタ部
51 気体吸入口
52 気体排出口
6 カバー体
61 配線コネクタ
Claims (10)
- 弁体を駆動するアクチュエータと、
前記弁体と接離する弁座及び排出路を有し、前記アクチュエータを固定する弁座プレートと、
前記弁座プレートを収納する本体ケースと、を備える圧電式バルブであって、
前記アクチュエータは、
前記弁座プレートに固定される基部と、
前記基部の取付け面に一端部が接続され、第1長手方向に延びる圧電素子と、
前記基部に一体に設けられ、前記圧電素子と並んで前記第1長手方向と交差する第2長手方向に延びる支持部と、
前記圧電素子の他端部及び前記支持部の先端部とが接続され、前記圧電素子の伸縮に伴って、前記第1長手方向及び前記第2長手方向それぞれと異なる方向に変位する作用部と、
前記作用部の前記変位する方向の側に設けられ、前記作用部の変位によって駆動される前記弁体と、を備え、
前記支持部は、前記第2長手方向に延びる中間部分にくびれ部を有し、前記くびれ部よりも前記基部の側において前記弁座プレートに固定され、
前記本体ケースは、
圧縮気体が供給される気体供給口と、
前記気体供給口から供給された圧縮気体を前記弁体と前記弁座との離間によって前記弁座プレートの前記排出路を介して排出する気体排出口と、
を備えることを特徴とする圧電式バルブ。 - 複数の弁体をそれぞれ個別に平行な面内で駆動する複数のアクチュエータと、
前記複数の弁体とそれぞれ個別に接離する弁座及び排出路を複数有し、前記複数のアクチュエータを固定する弁座プレートと、
前記弁座プレートを収納する本体ケースと、を備える圧電式バルブであって、
前記複数のアクチュエータのそれぞれは、
前記弁座プレートに固定される基部と、
前記基部の取付け面に一端部が接続され、第1長手方向に延びる圧電素子と、
前記基部に一体に設けられ、前記圧電素子と並んで前記第1長手方向と交差する第2長手方向に延びる支持部と、
前記圧電素子の他端部及び前記支持部の先端部とが接続され、前記圧電素子の伸縮に伴って、前記第1長手方向及び前記第2長手方向それぞれと異なる方向に変位する作用部と、
前記作用部の前記変位する方向の側に設けられ、前記作用部の変位によって駆動される前記弁体と、を備え、
前記支持部は、前記第2長手方向に延びる中間部分にくびれ部を有し、前記くびれ部よりも前記基部の側において前記弁座プレートに固定され、
前記本体ケースは、
圧縮気体が供給される気体供給口と、
前記気体供給口から供給された圧縮気体を前記複数の弁体と前記複数の弁座との離間によって前記弁座プレートの前記各排出路を介してそれぞれ個別に排出する複数の気体排出口と、
を備えることを特徴とする圧電式バルブ。 - 前記基部は、少なくとも前記圧電素子の一端部が接続される側において前記弁座プレートに固定される請求項1又は2に記載の圧電式バルブ。
- 前記支持部の前記くびれ部から前記先端部までの長さにより、前記弁体の変位量を調整する請求項1乃至2のいずれかに記載の圧電式バルブ。
- 前記圧電素子の前記一端部又は前記他端部の少なくとも一方は、前記支持部よりも線膨張係数の大きな材料からなる連結部を介して前記基部の取付け面又は前記作用部に接続される請求項1乃至2のいずれかに記載の圧電式バルブ。
- 前記連結部は、前記作用部に一体に設けられ、
前記圧電素子の前記他端部は、前記支持部よりも線膨張係数の大きな材料からなる前記連結部を介して前記作用部に接続される請求項5に記載の圧電式バルブ。 - 前記アクチュエータは、前記基部及び前記作用部のそれぞれに連結され、前記圧電素子を前記第1長手方向に圧縮する圧縮部材をさらに備える請求項1乃至2のいずれかに記載の圧電式バルブ。
- 前記アクチュエータは、前記基部及び前記作用部のそれぞれに連結され、前記圧電素子を前記第1長手方向に圧縮する前記圧縮部材を前記圧電素子の略中心軸上に備える請求項7に記載の圧電式バルブ。
- 前記基部と前記作用部との間であって、前記圧電素子と前記支持部との間に形成される隙間をシリコーンで埋める請求項1乃至2のいずれかに記載の圧電式バルブ。
- 前記基部と前記作用部との間であって、前記圧電素子と前記支持部との間に形成される隙間を等間隔とし、前記隙間をシリコーンで埋める請求項1乃至2のいずれかに記載の圧電式バルブ。
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WO2019009035A1 (ja) * | 2017-07-07 | 2019-01-10 | 有限会社メカノトランスフォーマ | 変位拡大機構、研磨装置、アクチュエータ、ディスペンサ、及びエアバルブ |
JP2020180628A (ja) * | 2019-04-23 | 2020-11-05 | 株式会社サタケ | 圧電式バルブ及び該圧電式バルブの製造方法 |
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2021
- 2021-04-21 JP JP2021072204A patent/JP2022166778A/ja active Pending
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2022
- 2022-03-29 WO PCT/JP2022/015648 patent/WO2022224757A1/ja active Application Filing
- 2022-03-29 CN CN202280028728.8A patent/CN117203457A/zh active Pending
- 2022-04-14 TW TW111114164A patent/TW202242293A/zh unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2019009035A1 (ja) * | 2017-07-07 | 2019-01-10 | 有限会社メカノトランスフォーマ | 変位拡大機構、研磨装置、アクチュエータ、ディスペンサ、及びエアバルブ |
JP2020180628A (ja) * | 2019-04-23 | 2020-11-05 | 株式会社サタケ | 圧電式バルブ及び該圧電式バルブの製造方法 |
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TW202242293A (zh) | 2022-11-01 |
CN117203457A (zh) | 2023-12-08 |
JP2022166778A (ja) | 2022-11-02 |
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